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साबित करें कि (i) (sinx -siny )/( cos...

साबित करें कि
(i) `(sinx -siny )/( cos x + cosy ) = tan. ( x-y)/(2)`
(ii) ` (sinx + siny )/( sinx - siny ) = tan ((x+y)/(2)). cot ((x-y)/(2))`

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